Growth in early species of the conodont Ancyrodella and implications for correlation of the Middle-Upper Devonian boundary

• Autorzy: Miller C.G.
• Języki publikacji: EN

Abstrakty

EN

The first occurrence of the conodont Ancyrodella rotundiloba has been used extensively for correlating the Middle-Up per Devonian (Givetian-Frasnian) boundary in sections worldwide despite many arguments as to its precise taxonomic definition. These arguments are summarised herein and three ontogenetic series illustrated from three samples across the Givetian-Frasnian boundary within the Vorota Formation of the Kozhym River section, Sub-Polar Urals, Russia. General trends within the three ontogenetic series suggest that the ratio of basal pit width to platform width in Ancyrodella pristina, and Ancyrodella recta in creases through ontogeny but the morphology of lateral secondary keel extensions to the basal pit remains constant and is a useful taxonomic feature. Folds and collars on the basal surface occur only in the later stages of development. The out line of the platform within species is variable and controlled by the formation of incipient nodes in juveniles; gerontic specimens can also have very variable platform out lines. Measure ments of platform width to basal pit width ratios and platform shape out lines may not therefore be a good way to compare between species. The three ontogenetic series provide typical late Givetian and early Frasnian examples and increase the potential for correlation of the Middle-Upper Devonian boundary particularly using juvenile Ancyrodella specimens.

Słowa kluczowe

EN

conodonts; Devonian; Givetian; Frasnian; Ancyrodella; ontogeny

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2007
• Tom: Vol. 51, No 4
• Strony: 443--452
• Opis fizyczny: bibliogr. 35 poz., fot., tab, wykr.

Twórcy

autor

Miller C.G.

• Department of Palaeontology, Natural History Museum, Cromwell Road, London SW7 5BD, UK,

Bibliografia

• BULTYNCK P. (1982) - The Ancyrodella binodosa-A. rotundiloba rotundiloba transition, a datum-level for correlation of the Givetian-Frasnian boundary. In: Papers on the Givetian-Frasnian Boundary (eds. F. Bigey et al.): 17-33. Min. Econ. Aff., Admin. Mines, Geol. Surv. Belg.
• BULTYNCK P. (1983) - Origin and development of the conodont genus Ancyrodella in the Givetian-early Frasnian. Fossils and Strata, 15: 163-168.
• BULTYNCK P. and JACOBS L. (1981) - Conodontes et sédimentologie des couches de passage du Givetien au Frasnien dans le Nord du Tafilalt et dans le Ma'der (Maroc Présaharien). Bull. Inst. Roy. Sc. Nat. de Belg., 53, Sci. de la Terre, 2: 1-24.
• DZIK J. (2002) - Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland. Acta Palaeont. Pol., 47 (4): 565-650.
• FEIST R. and KLAPPER G. (1985) - Stratigraphy and conodonts in pelagic sequences across Middle-Upper Devonian boundary, Montagne Noire, France. Palaeontogr., Abt. A, 188: 1-18.
• FEIST R., KIRCHGASSER W. T. and KLAPPER G. (1985) - Proposal for a Middle-Upper Devonian Boundary stratotype. In: Devonian Series Boundaries - Results of Worldwide Studies (eds. W. Ziegler and R. Werner). Courier Forsch.-Inst. Senckenberg, 75: 409-410.
• GARCÍA-LÓPEZ S. (1986) - Basis for the establishment of a new phylogeny forthe genus of Ancyrodella. Rev. Esp. Micropaleont., 18:443-345.
• IUDINA A. B. (1995) - Genus Ancyrodella succession in earliest Frasnian (?) of the northern Chernyshev Swell. Geolines, 3: 17-20.
• KHALYMBADZHA V. G. and CHERNYSHEVA N. G. (1970) - Konodonty rod Ancyrodella iz Devonskikh otlozheniy kraya i ikh Stratigrafiya i Biostratigrafiya i Paleontologiya Paleozoyskikh otlozheniy Vostoka Russkoy Platformy i Zapadnogo Priural'ya..,Izdat. Kazanskogo Univ. Vypusk, 1: 81-103.
• KIRCHGASSER W. T. (1994) - Early morphotypes of Ancyrodella rotundiloba at the Middle-Upper Devonian boundary, Genesee Formation, west-central New York. In: Studies in Stratigraphy and Paleontology in Honor of Donald W. Fisher (ed. E. Landing). New York State Mus. Bull., 481: 117-134.
• KLAPPER G. (1985) - Sequence in conodont genus Ancyrodella in Lower asymmetricus Zone (earliest Frasnian, Upper Devonian) of the Montagne Noire, France. Palaeontogr. Abt. A, 188: 19-34.
• KLAPPER G. (1989) - The Montagne Noire Frasnian (Upper Devonian) conodont succession. In: Devonian of the World (eds. N. J. Embry et al.). Can. Soc. Pet. Geol. Mem., 14 (3): 449-468.
• KLAPPER G. (1995) - Preliminary analysis of Frasnian, Late Devonian conodont biogeography. Hist. Biol., 10: 103-117.
• KLAPPER G. (2000) - Species of Spathognathodontidae and Polygnathidae (Conodonta) in the recognition of Upper Devonian stage boundaries. Courier Forsch.-Inst. Senckenberg, 220: 153-159.
• KLAPPER G. and BECKER R. T. (1999) - Comparison of Frasnian (Upper Devonian) conodont zonations. Boll. Soc. Paleont. Ital., 37 (2-3): 339-348.
• KLAPPER G. and FOSTER C. T., Jr. (1993) - Shape analysis of Frasnian species of the Late Devonian genus Palmatolepis. Pal. Soc. Mem., 32, J. Paleont., 67, suppl., 4.
• KLAPPER G. and PHILIP G. M. (1971) - Devonian conodont apparatuses and their vicarious skeletal elements. Lethaia, 4: 429-452.
• KLAPPER G. and PHILIP G. M. (1972) - Familial classification of reconstructed Devonian conodont apparatuses. Geol. Palaeont., 1: 87-114.
• KLAPPER G., FEIST R. and HOUSE M. R. (1987) - Decision on the Boundary Stratotype for the Middle/Upper Devonian Series Boundary. Episodes, 10 (2): 97-101.
• KLAPPER G., KUZMIN A. V. and OVNATANOVA N. S. (1996)-Upper Devonian conodonts from the Timan-Pechora region, Russia, and a correlation with a Frasnian composite standard. J. Paleont., 70 (1): 131-152.
• KLAPPER G., UYENO T. T., ARMSTRONG D. K. and TELFORD P. G. (2004) - Conodonts of the Williams Island and Long Rapids formations (Upper Devonian, Frasnian-Famennian) of the Onakawana Drillhole, Moose River Basin, Northern Ontario, with a revisions of Lower Famennian species. J. Paleont., 78 (2): 371-387.
• KRALICK J. A. (1994) - The conodont genus Ancyrodella in the Middle Genesee Formation (Lower Upper Devonian, Frasnian) western New York. J. Paleont., 68 (6): 1384-1395.
• McLEAN R. A. and KLAPPER G. (1998) - Biostratigraphy of Frasnian (upper Devonian) strata in western Canada based on conodonts and rugose corals. Bull. Can. Pet. Geol., 46: 515-563.
• OVNATANOVAN. S., KUZMIN A. V. and MENNER V. V. (1999) -The succession of Frasnian Conodont Assemblages in the type sections of the Southern Timan-Pechora Province (Russia). Boll. Soc. Paleont. Ital., 37 (2-3): 349-360.
• RACKI G. and WRZOLEK T. (1989) - Middle-Upper Devonian boundary: ambiguous reality of its stratotype. Courier Forsch.-Inst. Senckenberg, 110: 231-236.
• SANDBERG C. A., ZIEGLER W. and BULTYNCK P. (1989) - New standard conodont zones and early Ancyrodella phylogeny across Middle-Upper Devonian boundary. Courier Forsch.-Inst. Senckenberg, 110: 195-230.
• SAVAGE N. M. and YUDINA A. B. (1999) - Late Devonian Syv'yu River Section, Timan-Pechora Basin, Northwestern Russia. Boll. Soc. Paleont. Ital., 37 (2-3): 361-373.
• SAVAGE N. M. and YUDINA A. B. (2001) - Late Devonian (Frasnian) conodonts from the Timan-Pechora Basin, Russia. J. Czech Geol. Soc., 46 (3-2): 287-298.
• SCHÜLKE I. (1997) - Conodont clusters and multielement reconstructions from the Upper Kellwasser horizon at La Serre (Late Frasnian, Montagne Noire, southern France). Geol. Palaeont., 31: 37-66.
• TSYGANKO V. S. (2000) - Stop 7. Devonian succession on the Kozhym River Region. In: Pan-arctic Palaeozoic Tectonics, Evolution of Basins and Faunas, Sub-polar Urals Field Trip Guidebook. (eds. A. Antoshkina et al.). Suppl. Ichth. Iss. Spec. Publ., 6: 93-98.
• TSYGANKO V. S. (2002) - Stop 2. Pragian to Frasnian succession in the Kozhym River Region. In: Geology of the Devonian System. Subpolar Urals Field Trip Guidebook, July 13-17, 2002, Kozhym River. (ed. P. Männik): 17-20. Inst. Geol. Sykytvkar.
• UYENO T. (1967) - Conodont zonation, Waterways Formation (upper Devonian), northeastern and central Alberta. Geol. Surv. Can. Pap., 67-30: 1-21.
• YUDINA A. B., RACKI G., SAVAGE N. M., RACKA M. and MAŁKOWSKI K. (2002) - The Frasnian-Famennian events in a deep-shelf succession, Sub-Polar Urals: biotic, depositional and geochemical records. Acta Palaeont. Pol., 47 (2): 355-372.
• ZIEGLER W. (1962) - Taxonomie und Phylogenie Oberdevonischer Conodonten und ihre stratigraphische Bedeutung. Abh. Hess. Landes. Bodenforsch.,38: 1-166.
• ZIEGLER W. (1971) - Conodont stratigraphy of the European Devonian. In: Conodont Biostratigraphy. (eds. W. Sweet and S. M. Bergström). Mem. Geol. Soc. Am., 127: 227-284.
• ZIEGLER W. and SANDBERG C. A. (1990) - The Late Devonian standard conodont zonation. Courier Forsch.-Inst. Senckenberg, 121.